Signaling system



May 1930.

Filed Nov. 18, 1924 ll.. M. LEWIS ET AL SIGNALING SYSTEM 5 Sheets-Sheet l gnwufou .El daf/JMW' W /Dywg May 6, 1930. L.- M. -LEwls ET AL 1 1,757,674 i hSIGNALING SYSTEM Filed Nov. 18, 1924 3 Sheets-Sheet 2 O FIG. 8

L MJ: eww' A, tze/Hij# May s, 1930.

L. M. LEWIS ET AL SIGNALING SYSTEM Filed Nov. 18, 1924 3 She`ets-Sheet 3 1MM i Ljg/ Patented May 6, 1936 -UNITED STATES v1.1mm u. Lewis im ANDREW snznxorr, or'sAoR-AMENTo, oALnronNIA SIGNALING SYSTEM Application n led November 18, 1924. Seria. No. 750,562.

This invention relates to new and useful improvements in signaling systems.

The primary object of this invention is to provide a signaling system for automobiles,

whereby the driver of a vehicle equippedv with the same may warn pedestrians and drivers of other vehicles, located to the front,

to the rear, or to the left of the equipped vehicle, of his intentions to change'his direction or reduce his speed of travel.

A further object of the invent-ion is to provide a signaling system which employs only one signaling element for producing the above noted results.

A still further object of the invention is to provide a signaling system of the above noted type which is very eihcient in its operation and is of such a character that it is easily operated and may be quickly and easily repaired.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to. designate like parts throughout the same,

Figure 1 is a front elevational view of the signaling ellement,shown in full lines in one position and in dotted lines in two different positions for illustrating the different positions assumed thereby when giving the various possible warning si nals, and the casing employed for housing t e mechanism which actuates the signaling element,

Figure 2 illustrates in front elevation, partly broken away, the mechanism housed within the casing shown in Fig. 1, A

Figure 3 illustrates a side elevational view of the mechanism'shown in Fig. 2,

Figure 4 illustrates in vertical section the signal element carrying drum, I

Figure 5 shows in elevation the slgnaling element, its illuminating,` light, and its supporting drum,

Figure 6 shows in side elevation the casing illustrated in Fig. 1 mounted upon the left side of a vehicle, shown` in dotted lines, and

Figure 7 isa diagrammatical View of the c) wiring system employed for operating the mechanism illustrated in the aforementioned figures.

In the drawings', wherein for the purpose of illustration is shown a preferred embodiment of this invention, the numeral 5 designates a supporting plate or panel which is intended to be suitably secured to the body portion of an automobile, such as in the manner illustrated-in Fig. 6. This supporting plate or panel has formed integrally therewith or suitably secured thereto the laterally projecting spaced bracket arms 6 and 7 andthe laterally projecting platform 8.

suitably mounted in the vbracket arms 6 andv7 is a supportingshaft 9 having jour naled thereon, by means of antifriction bearings 10, a drum 11 which is openv at one end, as .at 12 and has a hub 13 formed integrally therewith. Suitably secured to the closed end 11n of this drum is a spring 14 which encircles the hub 13 and has its free end l@ Iprojecting axially from the open end 12 of the drum for engagement with the bracket arm 7. This drum 11 is further provided with a laterally projecting stud 15 adapted for engaging the upper surface of the bracket arm 7 when the drum 11 is sufficiently rotated upon the shaft 9. It will be seen that the spring 14, when compressed by the rotation of the drum 11 in the proper direction to move the stud 15 away from the upper surface of the bracket arm 7, will be constantly tending or exerting its power to rotate the drum 11 in the opposite direction or int-he proper direction' for again bringing the stud 15 intol engagement with the upper surface of the bracket arm 7.

The drum 11 is provided with the circumferentially extending grooves 16 and 17 which increase in depth fromend to end for forming the shoulders 18 and 19- respectively .at their deeper ends, as best illustrated in Fig. 2. It will be seen, by inspecting this Fig. 2, that the shoulders 18 and 19 are circumferentially spaced from each other. y

Suitahly mounted upon the platform 3 are the blocks 2() and 21 havin pivotally connected to the rear ends thereo the perpendicularly extending detents 22 and 23 which are positioned respectively in vertical alinement with, the grooves 16 and 17 formed in the drum 11.

In Fig. 2, the detents 22 and 23 are illustrated as having connected to the rear faces thereof the springs 24 which operate for retaining the said Vdetents pulled toward the supporting plate or panel 5, the said detents each being provided with a movement limiting set screw 25 which will engage the supporting plate or vpanel 5 at its inner end for checking the movement of its respective detent toward the supporting plate or panel 5. The said plate or panel is further provided with the series of guiding-lugs 26 which operate to prevent lateral displacement of the detents 22 and 23.

In Fig. 2 the detent 22 is shown as drawn `inwardly to the limit of its movement in the direction of the supporting plate or panel in which position, its freeend is shown as being spaced inwardly from the drum 11. In this same ligure, the detent 23 is shown as having been moved away from the supporting plate or panel 5 and has its upper end positioned in engagement with the shoulder 19 formed at one end of the groove 17. This detent 23 has been moved into this position or moved outwardly against the inward pull of the spring 24, by being attracted by the magnet 28, which is mounted upon the block 21 and extends perpendicularly therefrom for positioning its laterally projecting core 30 in operative relation to the intermediate portion of the detent 23. In Fig. 3, a magnet 27 is illustrated as extending perpendicularly from the'block 20 and as having a laterally projecting core 29 which is operatively associated with the detent'22 and is employed for attracting the same to pull the said detent away from the supporting plate or panel 5 against the inward pull of; its spring 24 whereby its outer end may be moved into the groove 16 formed in the circumference or periphery of the drum 11. The magnets l 27 and-28 arev electrically connected to the binding posts 31 and 32 respectively which in turn are intended to be connected to a source of electricity and suitable circuit making and breaking means. 1

The electric motor 33 is suitably mounted upon the platform 8 for causing its armature shaft to extend perpendicularly. The armature shaft of this motor 33 has mounted upon its upper projecting end the bevel gear 34 which is arranged to constantly mesh with the beveled teeth 35 formed on the edge of the drum 11. This electric motor 33 is electricallv connected to the binding terminals 36 which in turn are to be suitably connected to a source of electricity and circuit making and breaking means whereby the said motor may be Operated when desired. It is to be understood that this electric motor 33 functions. to di ive or rotate the drum 11 in the Closed end 11 of the drum 11 is the signaling element 37 which consists of the representation of a human arm and hand 38 and 39 respectively, the inner end of the arm 38 being the point at which the signaling element 37 is secured to the drum 11. This signaling element has mounted upon the arm portion thereof an illuminating light 40 which is arranged to direct its rays longitudinally along the arm 38` and hand 39, see Figs. 1 and 5.

Thesignaling element 37 is connected to the drum 11 in such a manner that when the arm 38 is in its full line position, as illustrated in Figs. 2 and 3, the spring 14 will be Y somewhat compressed or tightened and the free end of the detent 23 will be in engage L. When the signaling element extends upwardly at approximately a 45 angle in respect to the position L, the signaling element is intended to indicate the drivers intention to turn his vehicle to the right, therefore,

this position of the signaling element will be referred to by the character R. The signaling element is shown in full lines in this position in Fig. 1. When the said element is in its R position or right hand turn si aling position, the stud 15 carried by the diiim 11 will be in engagement with the upper surface of the bracket arm 7 and will be retained in this position by the spring 14. The remaining position of the signaling element, as illustrated in Figs. 1 and 2, is intended to indicate the driversintention to reduce his speed of travel or to stop, for this reason this downwardl outward extending position will be re erred to or esi ated by the character S. as shown in dotte lines in Fi s. 1 and 2. The detent 22 is to be employed or holding the signaling element 'm its S, or stop indicating position. This detent 22 is moved outwardly by its magnet 27 so that its outer end will engage the shoulder 18 formed at one end of the groove 16 in the drum 11.

The signaling element 37, when not in anyV 14. For this reason, suitable mechanism must be provided for retaining the signaling element in` this inoperative position. e

This mechanism includes t-he block 41 connected to the supporting plate or panel 5 by screws 42. This block 1s insulated from the plate or panel 5 by the piece of insulatingl material 43 and the insulating bushing 44` which surrounds the screw Suitably con-KV nec-ted to this block 41jand extending horizontally therefrom is an electric magnet 45 having its core 46 positioned with its o erative face depending therefrom. The lock 41 is further provided with a ivotally mounted latch 47 having a hookedp A contact point 49 is carried'by the underface of the latch 47 and is electrically connected with the binding post 50 thru the latch 47` and block 41. An arm 51 is connected to the'.

supporting plate or panel 5 by the screw 52 which is insulated from the plate or panel by the bushing 53. The arm 51 1s insulated from the plate or panel 5 by the piece of insulating material 43 referred to above;

operates with the Contact point 49 carried by the latch 47 for making and breaking a cirnects the latch 47 to the arm 51 nand operates to draw the former toward the latter. This spring 57 is insulated from the arm 51 by the insulator 58,A as best illustrated in Fig. 2. This arm holding mechanism further vincludes a keeper 59 suitably secured to the signaling element 37 and adapted for engagement with the hooked end 48 of the latch 47. The electric` magnet 45 is suitably connected with the binding terminals 60, see Fig. 3, which in turn are to be connected to a suitable source of electricity and circuit making and breaking means for energizing the magnet 45 when desired.

In Figs. 1 and 6, the casing 61 is illustrated as being suitably secured to the supportingv plate or panel 5 and acts as a housing for the mechanism previously referred to, that is with the exception of the signaling element when moved into its R,L or S position as shown in Fig. 1. This casing 61 has a perlpendicularly extending slot 62 by means of which the signaling element may and out of the said casing.

In Figs. 2 and 3, the supporting plate or panel 5 is illustrated as being provided with a cushioned stop 63 that is adapted for checking the movement of the signaling element pass into end 48.

e This arm carries an adjustable contact 54 which. co-

when shifted into its I or inoperative position. e

VTheuoperation of the mechanism so far described may set forth as follows i I It willl be considered that the signaling element 37 is in its I or inoperative position and is entirely housed within the casing 61. The` latch 47 is being held down into its signal element holding position bythe spring 57 and thru the ma et 27 for moving the detent 22 to cause its ree end to be received within the groove 16 formed in the periphery of the drum 1l. The magnet 45 should be energized, also, for moving-the latch member 47 upwardly againstvthe core 46 to release the signaling element v37. The spring 14 will then move the signaling element upwardly and outwardly u on its supporting shaft 9 until the free en of the detent 22 'engages the shoulder 18 in the groove 16 whereupon the signaling element 37 will be stopped and held in its S position. To return the signaling element to its I or inoperative position, the electric'motor 33 should be supplied with current for causing the same to rotate the drum 11 in the proper osition for moving the signaling elementV 37) into the 1casing 61 orjinto its I position. To cause aleft hand turn signal to beproduced, the electric magnet 28 should be energized for moving the detent 23 to cause its free end to enter the groove 17 in the drum l1. The magnet 45 should again be ener ized for disengaging the latch 47 from the eeper 59. The sprinfr -14 will then move the signaling element 3 outwardly and upwardly until thel free end of the detent 23 engages the shoulder 19 in the groove 17. This detent will then stop the upward movement of the signaling elementi" 37 and will hold the same in its L position.

To return the signaling element to its I or inoperative position, the motor 33 is again energized and rotates the drum 11 for mov-A ing the signaling element 37 into the casing The right hand turn signal may be produced by energizing the magnet 45 for .releasing the minating light 40 isto be automatically actuated every time the signaling element is moved out of the casing and into any of its si naling` positions so thatthe said element will be properly illuminated during the' hours y,

of darkness.

It is to be understood, also, that when the motor 33 isenergized for moving the signal element downwardly into its inoperative position from any of its operative positions, the current to the latch'holding magnet 45 should be automaticallybroken so-that the spring 57 may return the latch 47 tothe proper position for holding the said signaling element in its I position. f

It will be noticed that in Fig. 2, the latch 47 is retaining the signaling element in its I or inoperative position. The keeperv 59, while engaged by the latch 47 holds the latter in such a position that the con-tact point 49 is slightly spaced from the adjustable contact point 54. This spacing of the elements 49 and 54 is brought about in view of the fact -that the binding terminals 5() and 55 are connected in series with the electric motor 33 so that when the signaling element is being moved into its inoperative position by the motor 33, after the said element has been moved into a signaling position, the arrival of the keeper 59 at the hooked end 48 of the latch 47 will cause the latch to be moved upwardly for breaking the circuit to the motor 33 so that the arm Will not be further driven thereby and the retaining` of the contacts 49 and 54 in spaced relation will prevent the motor from being energized while the arm is in this inoperative position.

In the wiring diagram shown in Fig. 7 there are illustrated three switch structures RS; LS; and SS which are to be operated respectively for producing the right and left turn and the stop signals. In connection with each one of these switch structures, there is shown an arrow F which indicates the direction in which force is applied tol the portions of the switches engaged by the points of the arrow for operating the switches to produce the desired signal. It is not believed necessary to illustrate the specific elements, such as push buttons or pedals, that l may be used for manually producing the proper force against these switches, as such structure is not to be specifically claimed herein. It may be advisable to suggest, however, that the RS and LS switches may he rovided with the required operating orees y push buttons as 69` and 65 respectively, while the switch SS may be suitably connected with the brake pedal or clutch pedal 74a for obtaining the required force to operate the same. In this respect, should the switch SS be connect-ed to a speed controlling pedal of the vehicle, the stop signal/will be maintained aslong as the pedal is depressed and as soon as the pedal is released, the force will be removed from this switch and itV will This wiring systemiincludes a battery BA having one terminal grounded at Gr and having its remaining terminal connected by the wire 64 to the arm 65 of the switch structure RS'. This arm 65 is intended to normally rest in the position shown Vfor making contacts at -awith the arm 66. When the force F is applied to this arm 65, the connection is broken at #-aand is established at b with thearm 67. The arm 66 is connected by the wire 68 to the arm 69 of the switch structure LS. This arm 69 is normally held in the position shown whereby contactis made at -0- with the arm 70. Vhen the force F is applied to *he arm 69, the same is moved for establishing contact at '-'dwith the arm 71 which in `turn. is moved, while still in contact with the arm 69, until contact is made at -ewith the arm 72.

The arm 7 0 is connected by the Wire 73 with the arm 74 of the switch structure SS.' This arm 74 normally rests in a position for establishing contact at --fwith the arm 75. Vv'hen the force F is applied to the arm `'74. the Vsame is moved until contact is established at --,f/- with the arm 76,l which arm is moved with the arm 74 until Contact is established at -hwith the arm 77. I The arm 75 is connected by the wire 78 thru the binding terminal 50 of the latch 47 which carries the contact point 49. The binding terminal 55 of the arm 51 is connected by the wire 79 to ontJ binding terminal 36 of the motor 33. The remainingbinding terminal 36 of the motor 33 is connected by the wire 80 to the`ground G.

The arm 67 of the switch structure RS is connected by the wire 81 to the arm 77 of the switch structure SS while this wire 81 is connected to the arm 72 of the switch structure LS by the wire 82.

The arm 71 of the switch structure LS is connected by 'the wire `83 to one binding terminal 32 of the magnet 28, the remaining binding terminal 32 of this magnet being connected to the ground vG by the wire 84.

The arm 76 of the switch structure SS is connected bythe wire 85 to one binding terminal 31 of the magnet 27 which has its remaining binding terminal 31 connected by the wiref86 to the wire 80. The wire 80 has connected thereto one binding terminal ofthe magnet 45 by the wire 87 while the remaining binding terminal 60 of this magnet 45 is connected by the wire 88 to the wire 81. Connected in series between the wire 84 and 88, asby the wire 89 and 90, is the illuminating lamp 40.l

The operation of the entire signaling system will now be described as follows Y We will first assume that the signaling element 37 is in its I or inoperative position within the casingl. The switch structures RS, LS, and SS are all in the conditions illustrated in Fig. 7, and the Contact 49 is slightly spaced from the contact 54 for providing a break in the circuit to the motor 33.

Should the operator of the vehicle equipped with this signaling system desire to warn pedestrians and Vvehicle drivers of his intention to turn his vehicle to the right, force should be manually applied to the arm in the direction of the arrow F of the switch structure RS. This movement of the arms 65 will make contact at .-.54- with the-arm 67. A circuit will then be Vestablished from the ground-G thru the battery B, the wire 64 to the arm 65, and from the arm 65 thru the Contact -bto the arm 67. The circuit will continue from this arm 67 thru the wire 81 to the wire 88. This wire 88 will .carry the circuit to the magnet 45 which is connected by the wires 87 and 80 to the ground The wires 89 and 90 will also connect the light 40 in series with the wire 88 and the ground G. The magnet 45 will attract the latch 47 for moving its hooked end out of engagement with the keeper 59 whereupon the spring 14 will move the signaling element 37 outwardlyy and upwardly until the stud 15 engages the upper surface of the bracket arm 7. The 'signaling element 37 will then be in its R or right turn signaling position. The electric light 40 will b e illuminated for permitting the signaling element to be clearly seen. After the right turn signal has been displayed for a desired length of time, the force F is removed from-the arm 65 which will then return to the position illustrated in the battery B and the wire 64 to the arm 65.

The circuit will then flow from the arm 65 thru the contact -a--ito the arm'66which is connected by the wire 68 to the arm 69 of the switch structure LS. This arm 69 is electrically connected et -cto the arm 70 which is connected by the wire 73 to the arm 74 of the switch structure SS. 'This arm 74 is electrically connected at -fto the arm 75 which is connected by the wire 78 to the latch ,47.y The circuit then ycontinues thru the contacts 49 and 54 to the arm 51 and the Wire 79 to one side of the motor 33. The remaining side of this motor isconnected by moving the drum 11 and signaling element 37 until the latter is entirely housed within theA casing 61. The movement of the` signaling element 37 into the casing 61l causes the keeper 59l of the said element'to engage the latch 47, at its hooked end 48, for moving the said latch upwardly to cause the contact point 49 to be moved out of engagement with the adjustable contact 54 for breaking the 'circuit at this point to the electric motor 33. The latch 47 will be drawn into its signaling'element holding position, as shown in full lines in Fig. 2, bythe spring 57.

Should the operator ofthe vehicle desire to producea leftturn signal, force is applied at F to the arm 69 of the switchV structure LS. Three circuits will then'be established. The first extends from the ground Gthru the battery B to the arm` 65 of the switch structure RS by means ofthe wire 64. The circuit then continues from this arm 65 thru -the arm 66 and the wire 68 to the arm 69 ofthe switch structure LS. This arm 69 is in contact at -dwith the arm`71 which is connected by the wire 83 to the magnet 28 which has its -re maining binding post 32 connected to the ground G by means of the wire 84. Theen'- ergizing of the magnet 28 will cause the detent 23 to be attracted and moved away from the supporting plate or panel 5 for causinvr its free end to be moved into thel groove 17 formed in the drum 11. The second circuit includes the ground G, the battery B, the wire 64, the arm 65, the contact -a-, the arm 66, and the wire 68 to the arm 69 of the switch structure LS. The circuit then extends thru the contacts aiand -eand the arm 71 to the arm 72 which is connected by the wire 82 to the wire 81i Thisvwire 81 is connected by the wire 88 to one side of the magnet 45 which has itsV other side or terminal 60 connected'to the ground G by the wires 87 and 80. This circuit will energize the magnet 45 for causing the latch 47 to be elevated to release the signaling element 37 which 'will be moved outwardly and'upwardly by the spring 14 until the free end of the detent 23 engages the shoulder 19 formed at'the end of the groove 17. This detent will check theupward movement of the signaling element 37 and will hold the said element in its L or left turn signaling position, shown in lfull lines in Fig 2. The third circuit branches olf of the wire 88 atthe wire 90 and extends thru the electric light 40, the wire 89 .and 'the wire aus 84 to the ground G. This circuit energizes the light for causing the signaling element to be illuminated so that the same may be clearly seen at night.

The signaling element 371will lbe retained in its L position as long as the force F remains applied to the arm 69 of the switch structure LS. Vhen this force is removed from the larm 69, the circuits to the magnets 28 and 45 and to the light 40 are all broken, whereby the detent 23 is returned to its normal inoperative position by its spring 24 and the spring 57 pulls the latch 47 into its position for establishing the motor circuit previously referred to. Theenergizing of this motor 33 will cause the same to drive the drum 11 forL moving the signaling element 37 downwardly into the casing 61 when the keeper 59 will raise the latch 47 for breaking the circuit-to the said motor.

The slow or stop signal may be produced by applying force F to the arm 74 of the switch structure SS. When such a force is applied to this arm 74, there will be three circuits established also. y Y

The first of these three. `circuits will extend from the ground G thru the battery B and the wire 64 to the arml65 of the switch structure RS. 'Ihis arm 65 contacts at afwth the arm 66 which is connected by the wire 68 to the arm 69 of the switch structure 4 LS. This arm 69 contacts at -0- with the arm 70 which is connected by the wire 73 to the arm 74 of the switch structure SS. Y Thls which is connected by the wire to one binding terminal 31 of the magnet 27 which has its remaining terminal 31 connected by the wires 86 and 8O with the ground G. This circuit energizes the magnet 27 for causing the same to attract the detent 22 to move the same against the pull of its spring 24 outwardly away from the supporting plate 'or panel 5. This movement of the detent 22 will place its free end inthe groove 16 formed in the drum 11.

a The second circuit will be taken up from the wire 73 which receives its supply of current in a manner .just described. This wire 73 is connected tothe arm 74 ofthe swltch structure SS which contacts at -g with the arm 76. This arm 76 in turn contacts at t with. the arm 77 which is connected by the-wire 81 with thewire 88. This wire 88 extends to one terminal 60-of .the magnet 45 which has its remaining terminal 60 connected by the wires 87 and80 to the ground G. This circuit will energize the magnet- 45 for causing the upward movement of the latch 47 to disengage its hooked end 48 from the vkeeper59 of the signaling element 37. The spring 14-will then move this signaling element outwardly and upwardly until the free end of the detent 22 en ages the shoulder 18 formed atthe end o the groove 16.

This engagement of the `free endof the detent 22 with the shoulder 18 will check the upward movement of the signaling element for stopping the same when in-its S or stop signaling position as shown in Figs. 1 and 2..

The remaining of the third circuits extends from'the wire 88, which is included in the circuit to the magnet 45, and includes the wires 90, 89 and 84 by means of which the light 40 is connected in series with the ground G and the wire 88. The energizing of this light 40 will. illuminate the signaling element 37.

To return the signaling element 37 to its I or inoperative position within the casing 61, the force F is removed from the arm 74 of the switch structure SS and the three cir` `cuits just referredto will be broken. The breaking or' the circuit to the magnet 45 will permit theV latch 47 vto drop or be pulled downwardly by the spring 57 for causing the contact point 49 to engage the contact 54. A circuit will then be established which will include the motor 33. The energizing of this motor 33 will return the signaling element to its inoperative positionin the same manner as described in,connection with the returning of the signaling element to such position after having been moved in its R and L signaling positions.

It will be `clearly seen, by those skilled in the art, that after applying force at F to the arm 740i the switch structure SS for causing the signaling .element 37 to be held in its S position, the removal of this force F from the arm 74 and the applying of force at F to the arm 69 o the switchstructure LS, will break the old circuits and establish the new circuits vfor causing the signaling element 37 to be stopped in its L or left turn signaling position. In a similar manner, the

force may be removed from the switch structure LS and applied at F to the arm 65 of the switch structure RS for changing the signal from the left turn to the right turn. The switches may also be operated for permitting the signaling element tobe changed from the stop signal tofthe rightturn signal by renfovi'ng the force from the switch structure SS and applying force to the switch structure RS. To change the signal from right turn to left turn or stop or from left turn to stop, the signaling arm 37 must first be returned to its inoperative or I position, it being impossible tomakethese changes in the same manner as the changes are made from the sto to the left turn or right turn or from the eft turn to the right turn.

It is believed advisable to specifically call attention to the fact that when the spring 14 is moving the drum and the signaling elenent,the constant meshing of the beve gear 34with the teef/i135 of. the drum 11 willA cause the Yarmature of the motor 33 to ract as a drag upon the signaling element and drum thereby preventing too rapid upward movement of ,the signaling element.

It is now believed that the method of cons tructing and the manner of operating this signaling system will be clearly understood by those skilled in the artand that no further explanation is deemed necessary.

It is to be understood that the form ofthis invention herewith shown anddescribed is m to be taken as a preferred example of the same and that various changes in the shape, size and arrangement of parts ma be resorted to withoutdeparting from t e spirit of the invention or the scope of the subj oined claim.

Having thus described the. invention, we claim A signaling apparatus of the type de scribed comprising a rotary hollow drum, a i

signal arm attached thereto, a spring located A within said drum and connected thereto for rotating the drum to signaling position, electromagnetic means for rotating the drum in the opposite direction, automatically controlled electro-magnetic detents for arresting the rotation of said drum under the action of said spring, at different predetermined positions, means for locking the signal arm in a non-signaling position, and electro-magnetic means for re easing the lookin means, said' drum being formed with perip eral grooves spaced longitudinally thereof, ofgradually increasing depth, providing shoulders at their inner ends for the engagement of said detents, said shoulders being spaced peripherally of the drum means being provided for energizing one of the electro-magnets of the f detents and the electro-magnet of the locking means.

4o In testimony whereof we ailix ourx'signatures.

LLOYD M. LEWIS. ANDREW SEZEKOFF. 

